I dont know if you all saw this on the pay per view, but the punch was totally uncalled for and was out of frustration of loosing the fight. He threw the punch well after the 3rd round bell at his opponent. Technically it was an assault as it happened after the sanctioned part. It just came down on ESPN2 that he was officially cut a few min ago from Dana White himself and he will never grace the octagon again.
EDIT: the fight was scheduled for 3 rounds.
EDIT: the fight was scheduled for 3 rounds.